Kaoru “Caol” Uno (宇野薫 Uno Kaoru) (born May 8, 1975) is a Japanese mixed martial artist. He is the Co-Champion of the UFC 41 Lightweight Tournament and a former Shooto Lightweight Champion. As one of the early Ultimate Fighting Championship’s elite Lightweight competitors, Uno competed for the UFC Lightweight Championship on two separate occasions. Despite falling short in both championship bouts; losing a five-round decision against Jens Pulver at UFC 30, to determine the inaugural UFC Lightweight Champion as well as a draw against B.J. Penn at UFC 41 (in a bout which would have determined the new UFC Lightweight Champion and UFC 41 Lightweight Tournament Winner), Uno is acknowledged as a pioneer for his impact and influence during the early era of the UFC Lightweight Division.